From 07d98a33c219c3f01a11af205840c170f6b54917 Mon Sep 17 00:00:00 2001
From: "R. Timothy Edwards" <tim@opencircuitdesign.com>
Date: Wed, 8 Jul 2026 09:51:37 -0400
Subject: [PATCH] Fixed a negative tile width calculation in ResMakeRes.c, as
 pointed out by github user "LegumeEmittingDiode".  I agree with the suggested
 fix and have implemented it exactly as suggested in github issue #537.

---
 resis/ResMakeRes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/resis/ResMakeRes.c b/resis/ResMakeRes.c
index 7cd53121..12d1a8e9 100644
--- a/resis/ResMakeRes.c
+++ b/resis/ResMakeRes.c
@@ -147,7 +147,7 @@ ResCalcEastWest(tile, pendingList, doneList, resList)
     p1 = info->breakList;
     if   (p1->br_next == NULL)
     {
-	p1->br_this->rn_float.rn_area += height * (LEFT(tile) - RIGHT(tile));
+	p1->br_this->rn_float.rn_area += height * (RIGHT(tile) - LEFT(tile));
 	freeMagic((char *)p1);
 	info->breakList = NULL;
 	return(merged);